net/wireless/util.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Wireless utility functions
   4  *
   5  * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright 2017       Intel Deutschland GmbH
   8  * Copyright (C) 2018-2019 Intel Corporation
   9  */
  10 #include <linux/export.h>
  11 #include <linux/bitops.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/slab.h>
  14 #include <linux/ieee80211.h>
  15 #include <net/cfg80211.h>
  16 #include <net/ip.h>
  17 #include <net/dsfield.h>
  18 #include <linux/if_vlan.h>
  19 #include <linux/mpls.h>
  20 #include <linux/gcd.h>
  21 #include <linux/bitfield.h>
  22 #include <linux/nospec.h>
  23 #include "core.h"
  24 #include "rdev-ops.h"
  25
  26
  27 struct ieee80211_rate *
  28 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  29                             u32 basic_rates, int bitrate)
  30 {
  31         struct ieee80211_rate *result = &sband->bitrates[0];
  32         int i;
  33
  34         for (i = 0; i < sband->n_bitrates; i++) {
  35                 if (!(basic_rates & BIT(i)))
  36                         continue;
  37                 if (sband->bitrates[i].bitrate > bitrate)
  38                         continue;
  39                 result = &sband->bitrates[i];
  40         }
  41
  42         return result;
  43 }
  44 EXPORT_SYMBOL(ieee80211_get_response_rate);
  45
  46 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
  47                               enum nl80211_bss_scan_width scan_width)
  48 {
  49         struct ieee80211_rate *bitrates;
  50         u32 mandatory_rates = 0;
  51         enum ieee80211_rate_flags mandatory_flag;
  52         int i;
  53
  54         if (WARN_ON(!sband))
  55                 return 1;
  56
  57         if (sband->band == NL80211_BAND_2GHZ) {
  58                 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
  59                     scan_width == NL80211_BSS_CHAN_WIDTH_10)
  60                         mandatory_flag = IEEE80211_RATE_MANDATORY_G;
  61                 else
  62                         mandatory_flag = IEEE80211_RATE_MANDATORY_B;
  63         } else {
  64                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
  65         }
  66
  67         bitrates = sband->bitrates;
  68         for (i = 0; i < sband->n_bitrates; i++)
  69                 if (bitrates[i].flags & mandatory_flag)
  70                         mandatory_rates |= BIT(i);
  71         return mandatory_rates;
  72 }
  73 EXPORT_SYMBOL(ieee80211_mandatory_rates);
  74
  75 int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
  76 {
  77         /* see 802.11 17.3.8.3.2 and Annex J
  78          * there are overlapping channel numbers in 5GHz and 2GHz bands */
  79         if (chan <= 0)
  80                 return 0; /* not supported */
  81         switch (band) {
  82         case NL80211_BAND_2GHZ:
  83                 if (chan == 14)
  84                         return 2484;
  85                 else if (chan < 14)
  86                         return 2407 + chan * 5;
  87                 break;
  88         case NL80211_BAND_5GHZ:
  89                 if (chan >= 182 && chan <= 196)
  90                         return 4000 + chan * 5;
  91                 else
  92                         return 5000 + chan * 5;
  93                 break;
  94         case NL80211_BAND_6GHZ:
  95                 /* see 802.11ax D4.1 27.3.22.2 */
  96                 if (chan <= 253)
  97                         return 5940 + chan * 5;
  98                 break;
  99         case NL80211_BAND_60GHZ:
 100                 if (chan < 7)
 101                         return 56160 + chan * 2160;
 102                 break;
 103         default:
 104                 ;
 105         }
 106         return 0; /* not supported */
 107 }
 108 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
 109
 110 int ieee80211_frequency_to_channel(int freq)
 111 {
 112         /* see 802.11 17.3.8.3.2 and Annex J */
 113         if (freq == 2484)
 114                 return 14;
 115         else if (freq < 2484)
 116                 return (freq - 2407) / 5;
 117         else if (freq >= 4910 && freq <= 4980)
 118                 return (freq - 4000) / 5;
 119         else if (freq < 5925)
 120                 return (freq - 5000) / 5;
 121         else if (freq == 5935)
 122                 return 2;
 123         else if (freq <= 45000) /* DMG band lower limit */
 124                 /* see 802.11ax D6.1 27.3.22.2 */
 125                 return (freq - 5950) / 5;
 126         else if (freq >= 58320 && freq <= 70200)
 127                 return (freq - 56160) / 2160;
 128         else
 129                 return 0;
 130 }
 131 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
 132
 133 struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy, int freq)
 134 {
 135         enum nl80211_band band;
 136         struct ieee80211_supported_band *sband;
 137         int i;
 138
 139         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 140                 sband = wiphy->bands[band];
 141
 142                 if (!sband)
 143                         continue;
 144
 145                 for (i = 0; i < sband->n_channels; i++) {
 146                         if (sband->channels[i].center_freq == freq)
 147                                 return &sband->channels[i];
 148                 }
 149         }
 150
 151         return NULL;
 152 }
 153 EXPORT_SYMBOL(ieee80211_get_channel);
 154
 155 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
 156 {
 157         int i, want;
 158
 159         switch (sband->band) {
 160         case NL80211_BAND_5GHZ:
 161         case NL80211_BAND_6GHZ:
 162                 want = 3;
 163                 for (i = 0; i < sband->n_bitrates; i++) {
 164                         if (sband->bitrates[i].bitrate == 60 ||
 165                             sband->bitrates[i].bitrate == 120 ||
 166                             sband->bitrates[i].bitrate == 240) {
 167                                 sband->bitrates[i].flags |=
 168                                         IEEE80211_RATE_MANDATORY_A;
 169                                 want--;
 170                         }
 171                 }
 172                 WARN_ON(want);
 173                 break;
 174         case NL80211_BAND_2GHZ:
 175                 want = 7;
 176                 for (i = 0; i < sband->n_bitrates; i++) {
 177                         switch (sband->bitrates[i].bitrate) {
 178                         case 10:
 179                         case 20:
 180                         case 55:
 181                         case 110:
 182                                 sband->bitrates[i].flags |=
 183                                         IEEE80211_RATE_MANDATORY_B |
 184                                         IEEE80211_RATE_MANDATORY_G;
 185                                 want--;
 186                                 break;
 187                         case 60:
 188                         case 120:
 189                         case 240:
 190                                 sband->bitrates[i].flags |=
 191                                         IEEE80211_RATE_MANDATORY_G;
 192                                 want--;
 193                                 /* fall through */
 194                         default:
 195                                 sband->bitrates[i].flags |=
 196                                         IEEE80211_RATE_ERP_G;
 197                                 break;
 198                         }
 199                 }
 200                 WARN_ON(want != 0 && want != 3);
 201                 break;
 202         case NL80211_BAND_60GHZ:
 203                 /* check for mandatory HT MCS 1..4 */
 204                 WARN_ON(!sband->ht_cap.ht_supported);
 205                 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 206                 break;
 207         case NUM_NL80211_BANDS:
 208         default:
 209                 WARN_ON(1);
 210                 break;
 211         }
 212 }
 213
 214 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 215 {
 216         enum nl80211_band band;
 217
 218         for (band = 0; band < NUM_NL80211_BANDS; band++)
 219                 if (wiphy->bands[band])
 220                         set_mandatory_flags_band(wiphy->bands[band]);
 221 }
 222
 223 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 224 {
 225         int i;
 226         for (i = 0; i < wiphy->n_cipher_suites; i++)
 227                 if (cipher == wiphy->cipher_suites[i])
 228                         return true;
 229         return false;
 230 }
 231
 232 static bool
 233 cfg80211_igtk_cipher_supported(struct cfg80211_registered_device *rdev)
 234 {
 235         struct wiphy *wiphy = &rdev->wiphy;
 236         int i;
 237
 238         for (i = 0; i < wiphy->n_cipher_suites; i++) {
 239                 switch (wiphy->cipher_suites[i]) {
 240                 case WLAN_CIPHER_SUITE_AES_CMAC:
 241                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 242                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 243                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 244                         return true;
 245                 }
 246         }
 247
 248         return false;
 249 }
 250
 251 bool cfg80211_valid_key_idx(struct cfg80211_registered_device *rdev,
 252                             int key_idx, bool pairwise)
 253 {
 254         int max_key_idx;
 255
 256         if (pairwise)
 257                 max_key_idx = 3;
 258         else if (cfg80211_igtk_cipher_supported(rdev))
 259                 max_key_idx = 5;
 260         else
 261                 max_key_idx = 3;
 262
 263         if (key_idx < 0 || key_idx > max_key_idx)
 264                 return false;
 265
 266         return true;
 267 }
 268
 269 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 270                                    struct key_params *params, int key_idx,
 271                                    bool pairwise, const u8 *mac_addr)
 272 {
 273         if (!cfg80211_valid_key_idx(rdev, key_idx, pairwise))
 274                 return -EINVAL;
 275
 276         if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 277                 return -EINVAL;
 278
 279         if (pairwise && !mac_addr)
 280                 return -EINVAL;
 281
 282         switch (params->cipher) {
 283         case WLAN_CIPHER_SUITE_TKIP:
 284                 /* Extended Key ID can only be used with CCMP/GCMP ciphers */
 285                 if ((pairwise && key_idx) ||
 286                     params->mode != NL80211_KEY_RX_TX)
 287                         return -EINVAL;
 288                 break;
 289         case WLAN_CIPHER_SUITE_CCMP:
 290         case WLAN_CIPHER_SUITE_CCMP_256:
 291         case WLAN_CIPHER_SUITE_GCMP:
 292         case WLAN_CIPHER_SUITE_GCMP_256:
 293                 /* IEEE802.11-2016 allows only 0 and - when supporting
 294                  * Extended Key ID - 1 as index for pairwise keys.
 295                  * @NL80211_KEY_NO_TX is only allowed for pairwise keys when
 296                  * the driver supports Extended Key ID.
 297                  * @NL80211_KEY_SET_TX can't be set when installing and
 298                  * validating a key.
 299                  */
 300                 if ((params->mode == NL80211_KEY_NO_TX && !pairwise) ||
 301                     params->mode == NL80211_KEY_SET_TX)
 302                         return -EINVAL;
 303                 if (wiphy_ext_feature_isset(&rdev->wiphy,
 304                                             NL80211_EXT_FEATURE_EXT_KEY_ID)) {
 305                         if (pairwise && (key_idx < 0 || key_idx > 1))
 306                                 return -EINVAL;
 307                 } else if (pairwise && key_idx) {
 308                         return -EINVAL;
 309                 }
 310                 break;
 311         case WLAN_CIPHER_SUITE_AES_CMAC:
 312         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 313         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 314         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 315                 /* Disallow BIP (group-only) cipher as pairwise cipher */
 316                 if (pairwise)
 317                         return -EINVAL;
 318                 if (key_idx < 4)
 319                         return -EINVAL;
 320                 break;
 321         case WLAN_CIPHER_SUITE_WEP40:
 322         case WLAN_CIPHER_SUITE_WEP104:
 323                 if (key_idx > 3)
 324                         return -EINVAL;
 325         default:
 326                 break;
 327         }
 328
 329         switch (params->cipher) {
 330         case WLAN_CIPHER_SUITE_WEP40:
 331                 if (params->key_len != WLAN_KEY_LEN_WEP40)
 332                         return -EINVAL;
 333                 break;
 334         case WLAN_CIPHER_SUITE_TKIP:
 335                 if (params->key_len != WLAN_KEY_LEN_TKIP)
 336                         return -EINVAL;
 337                 break;
 338         case WLAN_CIPHER_SUITE_CCMP:
 339                 if (params->key_len != WLAN_KEY_LEN_CCMP)
 340                         return -EINVAL;
 341                 break;
 342         case WLAN_CIPHER_SUITE_CCMP_256:
 343                 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
 344                         return -EINVAL;
 345                 break;
 346         case WLAN_CIPHER_SUITE_GCMP:
 347                 if (params->key_len != WLAN_KEY_LEN_GCMP)
 348                         return -EINVAL;
 349                 break;
 350         case WLAN_CIPHER_SUITE_GCMP_256:
 351                 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
 352                         return -EINVAL;
 353                 break;
 354         case WLAN_CIPHER_SUITE_WEP104:
 355                 if (params->key_len != WLAN_KEY_LEN_WEP104)
 356                         return -EINVAL;
 357                 break;
 358         case WLAN_CIPHER_SUITE_AES_CMAC:
 359                 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 360                         return -EINVAL;
 361                 break;
 362         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 363                 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
 364                         return -EINVAL;
 365                 break;
 366         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 367                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
 368                         return -EINVAL;
 369                 break;
 370         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 371                 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
 372                         return -EINVAL;
 373                 break;
 374         default:
 375                 /*
 376                  * We don't know anything about this algorithm,
 377                  * allow using it -- but the driver must check
 378                  * all parameters! We still check below whether
 379                  * or not the driver supports this algorithm,
 380                  * of course.
 381                  */
 382                 break;
 383         }
 384
 385         if (params->seq) {
 386                 switch (params->cipher) {
 387                 case WLAN_CIPHER_SUITE_WEP40:
 388                 case WLAN_CIPHER_SUITE_WEP104:
 389                         /* These ciphers do not use key sequence */
 390                         return -EINVAL;
 391                 case WLAN_CIPHER_SUITE_TKIP:
 392                 case WLAN_CIPHER_SUITE_CCMP:
 393                 case WLAN_CIPHER_SUITE_CCMP_256:
 394                 case WLAN_CIPHER_SUITE_GCMP:
 395                 case WLAN_CIPHER_SUITE_GCMP_256:
 396                 case WLAN_CIPHER_SUITE_AES_CMAC:
 397                 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 398                 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 399                 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 400                         if (params->seq_len != 6)
 401                                 return -EINVAL;
 402                         break;
 403                 }
 404         }
 405
 406         if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 407                 return -EINVAL;
 408
 409         return 0;
 410 }
 411
 412 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 413 {
 414         unsigned int hdrlen = 24;
 415
 416         if (ieee80211_is_data(fc)) {
 417                 if (ieee80211_has_a4(fc))
 418                         hdrlen = 30;
 419                 if (ieee80211_is_data_qos(fc)) {
 420                         hdrlen += IEEE80211_QOS_CTL_LEN;
 421                         if (ieee80211_has_order(fc))
 422                                 hdrlen += IEEE80211_HT_CTL_LEN;
 423                 }
 424                 goto out;
 425         }
 426
 427         if (ieee80211_is_mgmt(fc)) {
 428                 if (ieee80211_has_order(fc))
 429                         hdrlen += IEEE80211_HT_CTL_LEN;
 430                 goto out;
 431         }
 432
 433         if (ieee80211_is_ctl(fc)) {
 434                 /*
 435                  * ACK and CTS are 10 bytes, all others 16. To see how
 436                  * to get this condition consider
 437                  *   subtype mask:   0b0000000011110000 (0x00F0)
 438                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 439                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 440                  *   bits that matter:         ^^^      (0x00E0)
 441                  *   value of those: 0b0000000011000000 (0x00C0)
 442                  */
 443                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 444                         hdrlen = 10;
 445                 else
 446                         hdrlen = 16;
 447         }
 448 out:
 449         return hdrlen;
 450 }
 451 EXPORT_SYMBOL(ieee80211_hdrlen);
 452
 453 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 454 {
 455         const struct ieee80211_hdr *hdr =
 456                         (const struct ieee80211_hdr *)skb->data;
 457         unsigned int hdrlen;
 458
 459         if (unlikely(skb->len < 10))
 460                 return 0;
 461         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 462         if (unlikely(hdrlen > skb->len))
 463                 return 0;
 464         return hdrlen;
 465 }
 466 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 467
 468 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
 469 {
 470         int ae = flags & MESH_FLAGS_AE;
 471         /* 802.11-2012, 8.2.4.7.3 */
 472         switch (ae) {
 473         default:
 474         case 0:
 475                 return 6;
 476         case MESH_FLAGS_AE_A4:
 477                 return 12;
 478         case MESH_FLAGS_AE_A5_A6:
 479                 return 18;
 480         }
 481 }
 482
 483 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 484 {
 485         return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
 486 }
 487 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
 488
 489 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
 490                                   const u8 *addr, enum nl80211_iftype iftype,
 491                                   u8 data_offset, bool is_amsdu)
 492 {
 493         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 494         struct {
 495                 u8 hdr[ETH_ALEN] __aligned(2);
 496                 __be16 proto;
 497         } payload;
 498         struct ethhdr tmp;
 499         u16 hdrlen;
 500         u8 mesh_flags = 0;
 501
 502         if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 503                 return -1;
 504
 505         hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
 506         if (skb->len < hdrlen + 8)
 507                 return -1;
 508
 509         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 510          * header
 511          * IEEE 802.11 address fields:
 512          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 513          *   0     0   DA    SA    BSSID n/a
 514          *   0     1   DA    BSSID SA    n/a
 515          *   1     0   BSSID SA    DA    n/a
 516          *   1     1   RA    TA    DA    SA
 517          */
 518         memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
 519         memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
 520
 521         if (iftype == NL80211_IFTYPE_MESH_POINT)
 522                 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
 523
 524         mesh_flags &= MESH_FLAGS_AE;
 525
 526         switch (hdr->frame_control &
 527                 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 528         case cpu_to_le16(IEEE80211_FCTL_TODS):
 529                 if (unlikely(iftype != NL80211_IFTYPE_AP &&
 530                              iftype != NL80211_IFTYPE_AP_VLAN &&
 531                              iftype != NL80211_IFTYPE_P2P_GO))
 532                         return -1;
 533                 break;
 534         case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 535                 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 536                              iftype != NL80211_IFTYPE_MESH_POINT &&
 537                              iftype != NL80211_IFTYPE_AP_VLAN &&
 538                              iftype != NL80211_IFTYPE_STATION))
 539                         return -1;
 540                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 541                         if (mesh_flags == MESH_FLAGS_AE_A4)
 542                                 return -1;
 543                         if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
 544                                 skb_copy_bits(skb, hdrlen +
 545                                         offsetof(struct ieee80211s_hdr, eaddr1),
 546                                         tmp.h_dest, 2 * ETH_ALEN);
 547                         }
 548                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 549                 }
 550                 break;
 551         case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 552                 if ((iftype != NL80211_IFTYPE_STATION &&
 553                      iftype != NL80211_IFTYPE_P2P_CLIENT &&
 554                      iftype != NL80211_IFTYPE_MESH_POINT) ||
 555                     (is_multicast_ether_addr(tmp.h_dest) &&
 556                      ether_addr_equal(tmp.h_source, addr)))
 557                         return -1;
 558                 if (iftype == NL80211_IFTYPE_MESH_POINT) {
 559                         if (mesh_flags == MESH_FLAGS_AE_A5_A6)
 560                                 return -1;
 561                         if (mesh_flags == MESH_FLAGS_AE_A4)
 562                                 skb_copy_bits(skb, hdrlen +
 563                                         offsetof(struct ieee80211s_hdr, eaddr1),
 564                                         tmp.h_source, ETH_ALEN);
 565                         hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
 566                 }
 567                 break;
 568         case cpu_to_le16(0):
 569                 if (iftype != NL80211_IFTYPE_ADHOC &&
 570                     iftype != NL80211_IFTYPE_STATION &&
 571                     iftype != NL80211_IFTYPE_OCB)
 572                                 return -1;
 573                 break;
 574         }
 575
 576         skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
 577         tmp.h_proto = payload.proto;
 578
 579         if (likely((!is_amsdu && ether_addr_equal(payload.hdr, rfc1042_header) &&
 580                     tmp.h_proto != htons(ETH_P_AARP) &&
 581                     tmp.h_proto != htons(ETH_P_IPX)) ||
 582                    ether_addr_equal(payload.hdr, bridge_tunnel_header)))
 583                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 584                  * replace EtherType */
 585                 hdrlen += ETH_ALEN + 2;
 586         else
 587                 tmp.h_proto = htons(skb->len - hdrlen);
 588
 589         pskb_pull(skb, hdrlen);
 590
 591         if (!ehdr)
 592                 ehdr = skb_push(skb, sizeof(struct ethhdr));
 593         memcpy(ehdr, &tmp, sizeof(tmp));
 594
 595         return 0;
 596 }
 597 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
 598
 599 static void
 600 __frame_add_frag(struct sk_buff *skb, struct page *page,
 601                  void *ptr, int len, int size)
 602 {
 603         struct skb_shared_info *sh = skb_shinfo(skb);
 604         int page_offset;
 605
 606         get_page(page);
 607         page_offset = ptr - page_address(page);
 608         skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
 609 }
 610
 611 static void
 612 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
 613                             int offset, int len)
 614 {
 615         struct skb_shared_info *sh = skb_shinfo(skb);
 616         const skb_frag_t *frag = &sh->frags[0];
 617         struct page *frag_page;
 618         void *frag_ptr;
 619         int frag_len, frag_size;
 620         int head_size = skb->len - skb->data_len;
 621         int cur_len;
 622
 623         frag_page = virt_to_head_page(skb->head);
 624         frag_ptr = skb->data;
 625         frag_size = head_size;
 626
 627         while (offset >= frag_size) {
 628                 offset -= frag_size;
 629                 frag_page = skb_frag_page(frag);
 630                 frag_ptr = skb_frag_address(frag);
 631                 frag_size = skb_frag_size(frag);
 632                 frag++;
 633         }
 634
 635         frag_ptr += offset;
 636         frag_len = frag_size - offset;
 637
 638         cur_len = min(len, frag_len);
 639
 640         __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
 641         len -= cur_len;
 642
 643         while (len > 0) {
 644                 frag_len = skb_frag_size(frag);
 645                 cur_len = min(len, frag_len);
 646                 __frame_add_frag(frame, skb_frag_page(frag),
 647                                  skb_frag_address(frag), cur_len, frag_len);
 648                 len -= cur_len;
 649                 frag++;
 650         }
 651 }
 652
 653 static struct sk_buff *
 654 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
 655                        int offset, int len, bool reuse_frag)
 656 {
 657         struct sk_buff *frame;
 658         int cur_len = len;
 659
 660         if (skb->len - offset < len)
 661                 return NULL;
 662
 663         /*
 664          * When reusing framents, copy some data to the head to simplify
 665          * ethernet header handling and speed up protocol header processing
 666          * in the stack later.
 667          */
 668         if (reuse_frag)
 669                 cur_len = min_t(int, len, 32);
 670
 671         /*
 672          * Allocate and reserve two bytes more for payload
 673          * alignment since sizeof(struct ethhdr) is 14.
 674          */
 675         frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
 676         if (!frame)
 677                 return NULL;
 678
 679         skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 680         skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
 681
 682         len -= cur_len;
 683         if (!len)
 684                 return frame;
 685
 686         offset += cur_len;
 687         __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
 688
 689         return frame;
 690 }
 691
 692 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 693                               const u8 *addr, enum nl80211_iftype iftype,
 694                               const unsigned int extra_headroom,
 695                               const u8 *check_da, const u8 *check_sa)
 696 {
 697         unsigned int hlen = ALIGN(extra_headroom, 4);
 698         struct sk_buff *frame = NULL;
 699         u16 ethertype;
 700         u8 *payload;
 701         int offset = 0, remaining;
 702         struct ethhdr eth;
 703         bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
 704         bool reuse_skb = false;
 705         bool last = false;
 706
 707         while (!last) {
 708                 unsigned int subframe_len;
 709                 int len;
 710                 u8 padding;
 711
 712                 skb_copy_bits(skb, offset, &eth, sizeof(eth));
 713                 len = ntohs(eth.h_proto);
 714                 subframe_len = sizeof(struct ethhdr) + len;
 715                 padding = (4 - subframe_len) & 0x3;
 716
 717                 /* the last MSDU has no padding */
 718                 remaining = skb->len - offset;
 719                 if (subframe_len > remaining)
 720                         goto purge;
 721                 /* mitigate A-MSDU aggregation injection attacks */
 722                 if (ether_addr_equal(eth.h_dest, rfc1042_header))
 723                         goto purge;
 724
 725                 offset += sizeof(struct ethhdr);
 726                 last = remaining <= subframe_len + padding;
 727
 728                 /* FIXME: should we really accept multicast DA? */
 729                 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
 730                      !ether_addr_equal(check_da, eth.h_dest)) ||
 731                     (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
 732                         offset += len + padding;
 733                         continue;
 734                 }
 735
 736                 /* reuse skb for the last subframe */
 737                 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
 738                         skb_pull(skb, offset);
 739                         frame = skb;
 740                         reuse_skb = true;
 741                 } else {
 742                         frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
 743                                                        reuse_frag);
 744                         if (!frame)
 745                                 goto purge;
 746
 747                         offset += len + padding;
 748                 }
 749
 750                 skb_reset_network_header(frame);
 751                 frame->dev = skb->dev;
 752                 frame->priority = skb->priority;
 753
 754                 payload = frame->data;
 755                 ethertype = (payload[6] << 8) | payload[7];
 756                 if (likely((ether_addr_equal(payload, rfc1042_header) &&
 757                             ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 758                            ether_addr_equal(payload, bridge_tunnel_header))) {
 759                         eth.h_proto = htons(ethertype);
 760                         skb_pull(frame, ETH_ALEN + 2);
 761                 }
 762
 763                 memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
 764                 __skb_queue_tail(list, frame);
 765         }
 766
 767         if (!reuse_skb)
 768                 dev_kfree_skb(skb);
 769
 770         return;
 771
 772  purge:
 773         __skb_queue_purge(list);
 774         dev_kfree_skb(skb);
 775 }
 776 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 777
 778 /* Given a data frame determine the 802.1p/1d tag to use. */
 779 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
 780                                     struct cfg80211_qos_map *qos_map)
 781 {
 782         unsigned int dscp;
 783         unsigned char vlan_priority;
 784         unsigned int ret;
 785
 786         /* skb->priority values from 256->263 are magic values to
 787          * directly indicate a specific 802.1d priority.  This is used
 788          * to allow 802.1d priority to be passed directly in from VLAN
 789          * tags, etc.
 790          */
 791         if (skb->priority >= 256 && skb->priority <= 263) {
 792                 ret = skb->priority - 256;
 793                 goto out;
 794         }
 795
 796         if (skb_vlan_tag_present(skb)) {
 797                 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
 798                         >> VLAN_PRIO_SHIFT;
 799                 if (vlan_priority > 0) {
 800                         ret = vlan_priority;
 801                         goto out;
 802                 }
 803         }
 804
 805         switch (skb->protocol) {
 806         case htons(ETH_P_IP):
 807                 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 808                 break;
 809         case htons(ETH_P_IPV6):
 810                 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 811                 break;
 812         case htons(ETH_P_MPLS_UC):
 813         case htons(ETH_P_MPLS_MC): {
 814                 struct mpls_label mpls_tmp, *mpls;
 815
 816                 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
 817                                           sizeof(*mpls), &mpls_tmp);
 818                 if (!mpls)
 819                         return 0;
 820
 821                 ret = (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
 822                         >> MPLS_LS_TC_SHIFT;
 823                 goto out;
 824         }
 825         case htons(ETH_P_80221):
 826                 /* 802.21 is always network control traffic */
 827                 return 7;
 828         default:
 829                 return 0;
 830         }
 831
 832         if (qos_map) {
 833                 unsigned int i, tmp_dscp = dscp >> 2;
 834
 835                 for (i = 0; i < qos_map->num_des; i++) {
 836                         if (tmp_dscp == qos_map->dscp_exception[i].dscp) {
 837                                 ret = qos_map->dscp_exception[i].up;
 838                                 goto out;
 839                         }
 840                 }
 841
 842                 for (i = 0; i < 8; i++) {
 843                         if (tmp_dscp >= qos_map->up[i].low &&
 844                             tmp_dscp <= qos_map->up[i].high) {
 845                                 ret = i;
 846                                 goto out;
 847                         }
 848                 }
 849         }
 850
 851         ret = dscp >> 5;
 852 out:
 853         return array_index_nospec(ret, IEEE80211_NUM_TIDS);
 854 }
 855 EXPORT_SYMBOL(cfg80211_classify8021d);
 856
 857 const struct element *ieee80211_bss_get_elem(struct cfg80211_bss *bss, u8 id)
 858 {
 859         const struct cfg80211_bss_ies *ies;
 860
 861         ies = rcu_dereference(bss->ies);
 862         if (!ies)
 863                 return NULL;
 864
 865         return cfg80211_find_elem(id, ies->data, ies->len);
 866 }
 867 EXPORT_SYMBOL(ieee80211_bss_get_elem);
 868
 869 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 870 {
 871         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 872         struct net_device *dev = wdev->netdev;
 873         int i;
 874
 875         if (!wdev->connect_keys)
 876                 return;
 877
 878         for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
 879                 if (!wdev->connect_keys->params[i].cipher)
 880                         continue;
 881                 if (rdev_add_key(rdev, dev, i, false, NULL,
 882                                  &wdev->connect_keys->params[i])) {
 883                         netdev_err(dev, "failed to set key %d\n", i);
 884                         continue;
 885                 }
 886                 if (wdev->connect_keys->def == i &&
 887                     rdev_set_default_key(rdev, dev, i, true, true)) {
 888                         netdev_err(dev, "failed to set defkey %d\n", i);
 889                         continue;
 890                 }
 891         }
 892
 893         kzfree(wdev->connect_keys);
 894         wdev->connect_keys = NULL;
 895 }
 896
 897 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 898 {
 899         struct cfg80211_event *ev;
 900         unsigned long flags;
 901
 902         spin_lock_irqsave(&wdev->event_lock, flags);
 903         while (!list_empty(&wdev->event_list)) {
 904                 ev = list_first_entry(&wdev->event_list,
 905                                       struct cfg80211_event, list);
 906                 list_del(&ev->list);
 907                 spin_unlock_irqrestore(&wdev->event_lock, flags);
 908
 909                 wdev_lock(wdev);
 910                 switch (ev->type) {
 911                 case EVENT_CONNECT_RESULT:
 912                         __cfg80211_connect_result(
 913                                 wdev->netdev,
 914                                 &ev->cr,
 915                                 ev->cr.status == WLAN_STATUS_SUCCESS);
 916                         break;
 917                 case EVENT_ROAMED:
 918                         __cfg80211_roamed(wdev, &ev->rm);
 919                         break;
 920                 case EVENT_DISCONNECTED:
 921                         __cfg80211_disconnected(wdev->netdev,
 922                                                 ev->dc.ie, ev->dc.ie_len,
 923                                                 ev->dc.reason,
 924                                                 !ev->dc.locally_generated);
 925                         break;
 926                 case EVENT_IBSS_JOINED:
 927                         __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 928                                                ev->ij.channel);
 929                         break;
 930                 case EVENT_STOPPED:
 931                         __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
 932                         break;
 933                 case EVENT_PORT_AUTHORIZED:
 934                         __cfg80211_port_authorized(wdev, ev->pa.bssid);
 935                         break;
 936                 }
 937                 wdev_unlock(wdev);
 938
 939                 kfree(ev);
 940
 941                 spin_lock_irqsave(&wdev->event_lock, flags);
 942         }
 943         spin_unlock_irqrestore(&wdev->event_lock, flags);
 944 }
 945
 946 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 947 {
 948         struct wireless_dev *wdev;
 949
 950         ASSERT_RTNL();
 951
 952         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
 953                 cfg80211_process_wdev_events(wdev);
 954 }
 955
 956 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 957                           struct net_device *dev, enum nl80211_iftype ntype,
 958                           struct vif_params *params)
 959 {
 960         int err;
 961         enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 962
 963         ASSERT_RTNL();
 964
 965         /* don't support changing VLANs, you just re-create them */
 966         if (otype == NL80211_IFTYPE_AP_VLAN)
 967                 return -EOPNOTSUPP;
 968
 969         /* cannot change into P2P device or NAN */
 970         if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
 971             ntype == NL80211_IFTYPE_NAN)
 972                 return -EOPNOTSUPP;
 973
 974         if (!rdev->ops->change_virtual_intf ||
 975             !(rdev->wiphy.interface_modes & (1 << ntype)))
 976                 return -EOPNOTSUPP;
 977
 978         if (ntype != otype) {
 979                 /* if it's part of a bridge, reject changing type to station/ibss */
 980                 if (netif_is_bridge_port(dev) &&
 981                     (ntype == NL80211_IFTYPE_ADHOC ||
 982                      ntype == NL80211_IFTYPE_STATION ||
 983                      ntype == NL80211_IFTYPE_P2P_CLIENT))
 984                         return -EBUSY;
 985
 986                 dev->ieee80211_ptr->use_4addr = false;
 987                 dev->ieee80211_ptr->mesh_id_up_len = 0;
 988                 wdev_lock(dev->ieee80211_ptr);
 989                 rdev_set_qos_map(rdev, dev, NULL);
 990                 wdev_unlock(dev->ieee80211_ptr);
 991
 992                 switch (otype) {
 993                 case NL80211_IFTYPE_AP:
 994                 case NL80211_IFTYPE_P2P_GO:
 995                         cfg80211_stop_ap(rdev, dev, true);
 996                         break;
 997                 case NL80211_IFTYPE_ADHOC:
 998                         cfg80211_leave_ibss(rdev, dev, false);
 999                         break;
1000                 case NL80211_IFTYPE_STATION:
1001                 case NL80211_IFTYPE_P2P_CLIENT:
1002                         wdev_lock(dev->ieee80211_ptr);
1003                         cfg80211_disconnect(rdev, dev,
1004                                             WLAN_REASON_DEAUTH_LEAVING, true);
1005                         wdev_unlock(dev->ieee80211_ptr);
1006                         break;
1007                 case NL80211_IFTYPE_MESH_POINT:
1008                         /* mesh should be handled? */
1009                         break;
1010                 case NL80211_IFTYPE_OCB:
1011                         cfg80211_leave_ocb(rdev, dev);
1012                         break;
1013                 default:
1014                         break;
1015                 }
1016
1017                 cfg80211_process_rdev_events(rdev);
1018                 cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
1019         }
1020
1021         err = rdev_change_virtual_intf(rdev, dev, ntype, params);
1022
1023         WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1024
1025         if (!err && params && params->use_4addr != -1)
1026                 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1027
1028         if (!err) {
1029                 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1030                 switch (ntype) {
1031                 case NL80211_IFTYPE_STATION:
1032                         if (dev->ieee80211_ptr->use_4addr)
1033                                 break;
1034                         /* fall through */
1035                 case NL80211_IFTYPE_OCB:
1036                 case NL80211_IFTYPE_P2P_CLIENT:
1037                 case NL80211_IFTYPE_ADHOC:
1038                         dev->priv_flags |= IFF_DONT_BRIDGE;
1039                         break;
1040                 case NL80211_IFTYPE_P2P_GO:
1041                 case NL80211_IFTYPE_AP:
1042                 case NL80211_IFTYPE_AP_VLAN:
1043                 case NL80211_IFTYPE_WDS:
1044                 case NL80211_IFTYPE_MESH_POINT:
1045                         /* bridging OK */
1046                         break;
1047                 case NL80211_IFTYPE_MONITOR:
1048                         /* monitor can't bridge anyway */
1049                         break;
1050                 case NL80211_IFTYPE_UNSPECIFIED:
1051                 case NUM_NL80211_IFTYPES:
1052                         /* not happening */
1053                         break;
1054                 case NL80211_IFTYPE_P2P_DEVICE:
1055                 case NL80211_IFTYPE_NAN:
1056                         WARN_ON(1);
1057                         break;
1058                 }
1059         }
1060
1061         if (!err && ntype != otype && netif_running(dev)) {
1062                 cfg80211_update_iface_num(rdev, ntype, 1);
1063                 cfg80211_update_iface_num(rdev, otype, -1);
1064         }
1065
1066         return err;
1067 }
1068
1069 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
1070 {
1071         int modulation, streams, bitrate;
1072
1073         /* the formula below does only work for MCS values smaller than 32 */
1074         if (WARN_ON_ONCE(rate->mcs >= 32))
1075                 return 0;
1076
1077         modulation = rate->mcs & 7;
1078         streams = (rate->mcs >> 3) + 1;
1079
1080         bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1081
1082         if (modulation < 4)
1083                 bitrate *= (modulation + 1);
1084         else if (modulation == 4)
1085                 bitrate *= (modulation + 2);
1086         else
1087                 bitrate *= (modulation + 3);
1088
1089         bitrate *= streams;
1090
1091         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1092                 bitrate = (bitrate / 9) * 10;
1093
1094         /* do NOT round down here */
1095         return (bitrate + 50000) / 100000;
1096 }
1097
1098 static u32 cfg80211_calculate_bitrate_dmg(struct rate_info *rate)
1099 {
1100         static const u32 __mcs2bitrate[] = {
1101                 /* control PHY */
1102                 [0] =   275,
1103                 /* SC PHY */
1104                 [1] =  3850,
1105                 [2] =  7700,
1106                 [3] =  9625,
1107                 [4] = 11550,
1108                 [5] = 12512, /* 1251.25 mbps */
1109                 [6] = 15400,
1110                 [7] = 19250,
1111                 [8] = 23100,
1112                 [9] = 25025,
1113                 [10] = 30800,
1114                 [11] = 38500,
1115                 [12] = 46200,
1116                 /* OFDM PHY */
1117                 [13] =  6930,
1118                 [14] =  8662, /* 866.25 mbps */
1119                 [15] = 13860,
1120                 [16] = 17325,
1121                 [17] = 20790,
1122                 [18] = 27720,
1123                 [19] = 34650,
1124                 [20] = 41580,
1125                 [21] = 45045,
1126                 [22] = 51975,
1127                 [23] = 62370,
1128                 [24] = 67568, /* 6756.75 mbps */
1129                 /* LP-SC PHY */
1130                 [25] =  6260,
1131                 [26] =  8340,
1132                 [27] = 11120,
1133                 [28] = 12510,
1134                 [29] = 16680,
1135                 [30] = 22240,
1136                 [31] = 25030,
1137         };
1138
1139         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1140                 return 0;
1141
1142         return __mcs2bitrate[rate->mcs];
1143 }
1144
1145 static u32 cfg80211_calculate_bitrate_edmg(struct rate_info *rate)
1146 {
1147         static const u32 __mcs2bitrate[] = {
1148                 /* control PHY */
1149                 [0] =   275,
1150                 /* SC PHY */
1151                 [1] =  3850,
1152                 [2] =  7700,
1153                 [3] =  9625,
1154                 [4] = 11550,
1155                 [5] = 12512, /* 1251.25 mbps */
1156                 [6] = 13475,
1157                 [7] = 15400,
1158                 [8] = 19250,
1159                 [9] = 23100,
1160                 [10] = 25025,
1161                 [11] = 26950,
1162                 [12] = 30800,
1163                 [13] = 38500,
1164                 [14] = 46200,
1165                 [15] = 50050,
1166                 [16] = 53900,
1167                 [17] = 57750,
1168                 [18] = 69300,
1169                 [19] = 75075,
1170                 [20] = 80850,
1171         };
1172
1173         if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1174                 return 0;
1175
1176         return __mcs2bitrate[rate->mcs] * rate->n_bonded_ch;
1177 }
1178
1179 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1180 {
1181         static const u32 base[4][10] = {
1182                 {   6500000,
1183                    13000000,
1184                    19500000,
1185                    26000000,
1186                    39000000,
1187                    52000000,
1188                    58500000,
1189                    65000000,
1190                    78000000,
1191                 /* not in the spec, but some devices use this: */
1192                    86500000,
1193                 },
1194                 {  13500000,
1195                    27000000,
1196                    40500000,
1197                    54000000,
1198                    81000000,
1199                   108000000,
1200                   121500000,
1201                   135000000,
1202                   162000000,
1203                   180000000,
1204                 },
1205                 {  29300000,
1206                    58500000,
1207                    87800000,
1208                   117000000,
1209                   175500000,
1210                   234000000,
1211                   263300000,
1212                   292500000,
1213                   351000000,
1214                   390000000,
1215                 },
1216                 {  58500000,
1217                   117000000,
1218                   175500000,
1219                   234000000,
1220                   351000000,
1221                   468000000,
1222                   526500000,
1223                   585000000,
1224                   702000000,
1225                   780000000,
1226                 },
1227         };
1228         u32 bitrate;
1229         int idx;
1230
1231         if (rate->mcs > 9)
1232                 goto warn;
1233
1234         switch (rate->bw) {
1235         case RATE_INFO_BW_160:
1236                 idx = 3;
1237                 break;
1238         case RATE_INFO_BW_80:
1239                 idx = 2;
1240                 break;
1241         case RATE_INFO_BW_40:
1242                 idx = 1;
1243                 break;
1244         case RATE_INFO_BW_5:
1245         case RATE_INFO_BW_10:
1246         default:
1247                 goto warn;
1248         case RATE_INFO_BW_20:
1249                 idx = 0;
1250         }
1251
1252         bitrate = base[idx][rate->mcs];
1253         bitrate *= rate->nss;
1254
1255         if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1256                 bitrate = (bitrate / 9) * 10;
1257
1258         /* do NOT round down here */
1259         return (bitrate + 50000) / 100000;
1260  warn:
1261         WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
1262                   rate->bw, rate->mcs, rate->nss);
1263         return 0;
1264 }
1265
1266 static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
1267 {
1268 #define SCALE 2048
1269         u16 mcs_divisors[12] = {
1270                 34133, /* 16.666666... */
1271                 17067, /*  8.333333... */
1272                 11378, /*  5.555555... */
1273                  8533, /*  4.166666... */
1274                  5689, /*  2.777777... */
1275                  4267, /*  2.083333... */
1276                  3923, /*  1.851851... */
1277                  3413, /*  1.666666... */
1278                  2844, /*  1.388888... */
1279                  2560, /*  1.250000... */
1280                  2276, /*  1.111111... */
1281                  2048, /*  1.000000... */
1282         };
1283         u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
1284         u32 rates_969[3] =  { 480388888, 453700000, 408333333 };
1285         u32 rates_484[3] =  { 229411111, 216666666, 195000000 };
1286         u32 rates_242[3] =  { 114711111, 108333333,  97500000 };
1287         u32 rates_106[3] =  {  40000000,  37777777,  34000000 };
1288         u32 rates_52[3]  =  {  18820000,  17777777,  16000000 };
1289         u32 rates_26[3]  =  {   9411111,   8888888,   8000000 };
1290         u64 tmp;
1291         u32 result;
1292
1293         if (WARN_ON_ONCE(rate->mcs > 11))
1294                 return 0;
1295
1296         if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
1297                 return 0;
1298         if (WARN_ON_ONCE(rate->he_ru_alloc >
1299                          NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
1300                 return 0;
1301         if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
1302                 return 0;
1303
1304         if (rate->bw == RATE_INFO_BW_160)
1305                 result = rates_160M[rate->he_gi];
1306         else if (rate->bw == RATE_INFO_BW_80 ||
1307                  (rate->bw == RATE_INFO_BW_HE_RU &&
1308                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
1309                 result = rates_969[rate->he_gi];
1310         else if (rate->bw == RATE_INFO_BW_40 ||
1311                  (rate->bw == RATE_INFO_BW_HE_RU &&
1312                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
1313                 result = rates_484[rate->he_gi];
1314         else if (rate->bw == RATE_INFO_BW_20 ||
1315                  (rate->bw == RATE_INFO_BW_HE_RU &&
1316                   rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
1317                 result = rates_242[rate->he_gi];
1318         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1319                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
1320                 result = rates_106[rate->he_gi];
1321         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1322                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
1323                 result = rates_52[rate->he_gi];
1324         else if (rate->bw == RATE_INFO_BW_HE_RU &&
1325                  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
1326                 result = rates_26[rate->he_gi];
1327         else {
1328                 WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
1329                      rate->bw, rate->he_ru_alloc);
1330                 return 0;
1331         }
1332
1333         /* now scale to the appropriate MCS */
1334         tmp = result;
1335         tmp *= SCALE;
1336         do_div(tmp, mcs_divisors[rate->mcs]);
1337         result = tmp;
1338
1339         /* and take NSS, DCM into account */
1340         result = (result * rate->nss) / 8;
1341         if (rate->he_dcm)
1342                 result /= 2;
1343
1344         return result / 10000;
1345 }
1346
1347 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1348 {
1349         if (rate->flags & RATE_INFO_FLAGS_MCS)
1350                 return cfg80211_calculate_bitrate_ht(rate);
1351         if (rate->flags & RATE_INFO_FLAGS_DMG)
1352                 return cfg80211_calculate_bitrate_dmg(rate);
1353         if (rate->flags & RATE_INFO_FLAGS_EDMG)
1354                 return cfg80211_calculate_bitrate_edmg(rate);
1355         if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1356                 return cfg80211_calculate_bitrate_vht(rate);
1357         if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
1358                 return cfg80211_calculate_bitrate_he(rate);
1359
1360         return rate->legacy;
1361 }
1362 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1363
1364 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1365                           enum ieee80211_p2p_attr_id attr,
1366                           u8 *buf, unsigned int bufsize)
1367 {
1368         u8 *out = buf;
1369         u16 attr_remaining = 0;
1370         bool desired_attr = false;
1371         u16 desired_len = 0;
1372
1373         while (len > 0) {
1374                 unsigned int iedatalen;
1375                 unsigned int copy;
1376                 const u8 *iedata;
1377
1378                 if (len < 2)
1379                         return -EILSEQ;
1380                 iedatalen = ies[1];
1381                 if (iedatalen + 2 > len)
1382                         return -EILSEQ;
1383
1384                 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1385                         goto cont;
1386
1387                 if (iedatalen < 4)
1388                         goto cont;
1389
1390                 iedata = ies + 2;
1391
1392                 /* check WFA OUI, P2P subtype */
1393                 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1394                     iedata[2] != 0x9a || iedata[3] != 0x09)
1395                         goto cont;
1396
1397                 iedatalen -= 4;
1398                 iedata += 4;
1399
1400                 /* check attribute continuation into this IE */
1401                 copy = min_t(unsigned int, attr_remaining, iedatalen);
1402                 if (copy && desired_attr) {
1403                         desired_len += copy;
1404                         if (out) {
1405                                 memcpy(out, iedata, min(bufsize, copy));
1406                                 out += min(bufsize, copy);
1407                                 bufsize -= min(bufsize, copy);
1408                         }
1409
1410
1411                         if (copy == attr_remaining)
1412                                 return desired_len;
1413                 }
1414
1415                 attr_remaining -= copy;
1416                 if (attr_remaining)
1417                         goto cont;
1418
1419                 iedatalen -= copy;
1420                 iedata += copy;
1421
1422                 while (iedatalen > 0) {
1423                         u16 attr_len;
1424
1425                         /* P2P attribute ID & size must fit */
1426                         if (iedatalen < 3)
1427                                 return -EILSEQ;
1428                         desired_attr = iedata[0] == attr;
1429                         attr_len = get_unaligned_le16(iedata + 1);
1430                         iedatalen -= 3;
1431                         iedata += 3;
1432
1433                         copy = min_t(unsigned int, attr_len, iedatalen);
1434
1435                         if (desired_attr) {
1436                                 desired_len += copy;
1437                                 if (out) {
1438                                         memcpy(out, iedata, min(bufsize, copy));
1439                                         out += min(bufsize, copy);
1440                                         bufsize -= min(bufsize, copy);
1441                                 }
1442
1443                                 if (copy == attr_len)
1444                                         return desired_len;
1445                         }
1446
1447                         iedata += copy;
1448                         iedatalen -= copy;
1449                         attr_remaining = attr_len - copy;
1450                 }
1451
1452  cont:
1453                 len -= ies[1] + 2;
1454                 ies += ies[1] + 2;
1455         }
1456
1457         if (attr_remaining && desired_attr)
1458                 return -EILSEQ;
1459
1460         return -ENOENT;
1461 }
1462 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1463
1464 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
1465 {
1466         int i;
1467
1468         /* Make sure array values are legal */
1469         if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
1470                 return false;
1471
1472         i = 0;
1473         while (i < n_ids) {
1474                 if (ids[i] == WLAN_EID_EXTENSION) {
1475                         if (id_ext && (ids[i + 1] == id))
1476                                 return true;
1477
1478                         i += 2;
1479                         continue;
1480                 }
1481
1482                 if (ids[i] == id && !id_ext)
1483                         return true;
1484
1485                 i++;
1486         }
1487         return false;
1488 }
1489
1490 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1491 {
1492         /* we assume a validly formed IEs buffer */
1493         u8 len = ies[pos + 1];
1494
1495         pos += 2 + len;
1496
1497         /* the IE itself must have 255 bytes for fragments to follow */
1498         if (len < 255)
1499                 return pos;
1500
1501         while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1502                 len = ies[pos + 1];
1503                 pos += 2 + len;
1504         }
1505
1506         return pos;
1507 }
1508
1509 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1510                               const u8 *ids, int n_ids,
1511                               const u8 *after_ric, int n_after_ric,
1512                               size_t offset)
1513 {
1514         size_t pos = offset;
1515
1516         while (pos < ielen) {
1517                 u8 ext = 0;
1518
1519                 if (ies[pos] == WLAN_EID_EXTENSION)
1520                         ext = 2;
1521                 if ((pos + ext) >= ielen)
1522                         break;
1523
1524                 if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
1525                                           ies[pos] == WLAN_EID_EXTENSION))
1526                         break;
1527
1528                 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1529                         pos = skip_ie(ies, ielen, pos);
1530
1531                         while (pos < ielen) {
1532                                 if (ies[pos] == WLAN_EID_EXTENSION)
1533                                         ext = 2;
1534                                 else
1535                                         ext = 0;
1536
1537                                 if ((pos + ext) >= ielen)
1538                                         break;
1539
1540                                 if (!ieee80211_id_in_list(after_ric,
1541                                                           n_after_ric,
1542                                                           ies[pos + ext],
1543                                                           ext == 2))
1544                                         pos = skip_ie(ies, ielen, pos);
1545                                 else
1546                                         break;
1547                         }
1548                 } else {
1549                         pos = skip_ie(ies, ielen, pos);
1550                 }
1551         }
1552
1553         return pos;
1554 }
1555 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1556
1557 bool ieee80211_operating_class_to_band(u8 operating_class,
1558                                        enum nl80211_band *band)
1559 {
1560         switch (operating_class) {
1561         case 112:
1562         case 115 ... 127:
1563         case 128 ... 130:
1564                 *band = NL80211_BAND_5GHZ;
1565                 return true;
1566         case 131 ... 135:
1567                 *band = NL80211_BAND_6GHZ;
1568                 return true;
1569         case 81:
1570         case 82:
1571         case 83:
1572         case 84:
1573                 *band = NL80211_BAND_2GHZ;
1574                 return true;
1575         case 180:
1576                 *band = NL80211_BAND_60GHZ;
1577                 return true;
1578         }
1579
1580         return false;
1581 }
1582 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1583
1584 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1585                                           u8 *op_class)
1586 {
1587         u8 vht_opclass;
1588         u32 freq = chandef->center_freq1;
1589
1590         if (freq >= 2412 && freq <= 2472) {
1591                 if (chandef->width > NL80211_CHAN_WIDTH_40)
1592                         return false;
1593
1594                 /* 2.407 GHz, channels 1..13 */
1595                 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1596                         if (freq > chandef->chan->center_freq)
1597                                 *op_class = 83; /* HT40+ */
1598                         else
1599                                 *op_class = 84; /* HT40- */
1600                 } else {
1601                         *op_class = 81;
1602                 }
1603
1604                 return true;
1605         }
1606
1607         if (freq == 2484) {
1608                 /* channel 14 is only for IEEE 802.11b */
1609                 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
1610                         return false;
1611
1612                 *op_class = 82; /* channel 14 */
1613                 return true;
1614         }
1615
1616         switch (chandef->width) {
1617         case NL80211_CHAN_WIDTH_80:
1618                 vht_opclass = 128;
1619                 break;
1620         case NL80211_CHAN_WIDTH_160:
1621                 vht_opclass = 129;
1622                 break;
1623         case NL80211_CHAN_WIDTH_80P80:
1624                 vht_opclass = 130;
1625                 break;
1626         case NL80211_CHAN_WIDTH_10:
1627         case NL80211_CHAN_WIDTH_5:
1628                 return false; /* unsupported for now */
1629         default:
1630                 vht_opclass = 0;
1631                 break;
1632         }
1633
1634         /* 5 GHz, channels 36..48 */
1635         if (freq >= 5180 && freq <= 5240) {
1636                 if (vht_opclass) {
1637                         *op_class = vht_opclass;
1638                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1639                         if (freq > chandef->chan->center_freq)
1640                                 *op_class = 116;
1641                         else
1642                                 *op_class = 117;
1643                 } else {
1644                         *op_class = 115;
1645                 }
1646
1647                 return true;
1648         }
1649
1650         /* 5 GHz, channels 52..64 */
1651         if (freq >= 5260 && freq <= 5320) {
1652                 if (vht_opclass) {
1653                         *op_class = vht_opclass;
1654                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1655                         if (freq > chandef->chan->center_freq)
1656                                 *op_class = 119;
1657                         else
1658                                 *op_class = 120;
1659                 } else {
1660                         *op_class = 118;
1661                 }
1662
1663                 return true;
1664         }
1665
1666         /* 5 GHz, channels 100..144 */
1667         if (freq >= 5500 && freq <= 5720) {
1668                 if (vht_opclass) {
1669                         *op_class = vht_opclass;
1670                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1671                         if (freq > chandef->chan->center_freq)
1672                                 *op_class = 122;
1673                         else
1674                                 *op_class = 123;
1675                 } else {
1676                         *op_class = 121;
1677                 }
1678
1679                 return true;
1680         }
1681
1682         /* 5 GHz, channels 149..169 */
1683         if (freq >= 5745 && freq <= 5845) {
1684                 if (vht_opclass) {
1685                         *op_class = vht_opclass;
1686                 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1687                         if (freq > chandef->chan->center_freq)
1688                                 *op_class = 126;
1689                         else
1690                                 *op_class = 127;
1691                 } else if (freq <= 5805) {
1692                         *op_class = 124;
1693                 } else {
1694                         *op_class = 125;
1695                 }
1696
1697                 return true;
1698         }
1699
1700         /* 56.16 GHz, channel 1..4 */
1701         if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 6) {
1702                 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1703                         return false;
1704
1705                 *op_class = 180;
1706                 return true;
1707         }
1708
1709         /* not supported yet */
1710         return false;
1711 }
1712 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1713
1714 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1715                                        u32 *beacon_int_gcd,
1716                                        bool *beacon_int_different)
1717 {
1718         struct wireless_dev *wdev;
1719
1720         *beacon_int_gcd = 0;
1721         *beacon_int_different = false;
1722
1723         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1724                 if (!wdev->beacon_interval)
1725                         continue;
1726
1727                 if (!*beacon_int_gcd) {
1728                         *beacon_int_gcd = wdev->beacon_interval;
1729                         continue;
1730                 }
1731
1732                 if (wdev->beacon_interval == *beacon_int_gcd)
1733                         continue;
1734
1735                 *beacon_int_different = true;
1736                 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1737         }
1738
1739         if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1740                 if (*beacon_int_gcd)
1741                         *beacon_int_different = true;
1742                 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1743         }
1744 }
1745
1746 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1747                                  enum nl80211_iftype iftype, u32 beacon_int)
1748 {
1749         /*
1750          * This is just a basic pre-condition check; if interface combinations
1751          * are possible the driver must already be checking those with a call
1752          * to cfg80211_check_combinations(), in which case we'll validate more
1753          * through the cfg80211_calculate_bi_data() call and code in
1754          * cfg80211_iter_combinations().
1755          */
1756
1757         if (beacon_int < 10 || beacon_int > 10000)
1758                 return -EINVAL;
1759
1760         return 0;
1761 }
1762
1763 int cfg80211_iter_combinations(struct wiphy *wiphy,
1764                                struct iface_combination_params *params,
1765                                void (*iter)(const struct ieee80211_iface_combination *c,
1766                                             void *data),
1767                                void *data)
1768 {
1769         const struct ieee80211_regdomain *regdom;
1770         enum nl80211_dfs_regions region = 0;
1771         int i, j, iftype;
1772         int num_interfaces = 0;
1773         u32 used_iftypes = 0;
1774         u32 beacon_int_gcd;
1775         bool beacon_int_different;
1776
1777         /*
1778          * This is a bit strange, since the iteration used to rely only on
1779          * the data given by the driver, but here it now relies on context,
1780          * in form of the currently operating interfaces.
1781          * This is OK for all current users, and saves us from having to
1782          * push the GCD calculations into all the drivers.
1783          * In the future, this should probably rely more on data that's in
1784          * cfg80211 already - the only thing not would appear to be any new
1785          * interfaces (while being brought up) and channel/radar data.
1786          */
1787         cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1788                                    &beacon_int_gcd, &beacon_int_different);
1789
1790         if (params->radar_detect) {
1791                 rcu_read_lock();
1792                 regdom = rcu_dereference(cfg80211_regdomain);
1793                 if (regdom)
1794                         region = regdom->dfs_region;
1795                 rcu_read_unlock();
1796         }
1797
1798         for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1799                 num_interfaces += params->iftype_num[iftype];
1800                 if (params->iftype_num[iftype] > 0 &&
1801                     !cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1802                         used_iftypes |= BIT(iftype);
1803         }
1804
1805         for (i = 0; i < wiphy->n_iface_combinations; i++) {
1806                 const struct ieee80211_iface_combination *c;
1807                 struct ieee80211_iface_limit *limits;
1808                 u32 all_iftypes = 0;
1809
1810                 c = &wiphy->iface_combinations[i];
1811
1812                 if (num_interfaces > c->max_interfaces)
1813                         continue;
1814                 if (params->num_different_channels > c->num_different_channels)
1815                         continue;
1816
1817                 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1818                                  GFP_KERNEL);
1819                 if (!limits)
1820                         return -ENOMEM;
1821
1822                 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1823                         if (cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
1824                                 continue;
1825                         for (j = 0; j < c->n_limits; j++) {
1826                                 all_iftypes |= limits[j].types;
1827                                 if (!(limits[j].types & BIT(iftype)))
1828                                         continue;
1829                                 if (limits[j].max < params->iftype_num[iftype])
1830                                         goto cont;
1831                                 limits[j].max -= params->iftype_num[iftype];
1832                         }
1833                 }
1834
1835                 if (params->radar_detect !=
1836                         (c->radar_detect_widths & params->radar_detect))
1837                         goto cont;
1838
1839                 if (params->radar_detect && c->radar_detect_regions &&
1840                     !(c->radar_detect_regions & BIT(region)))
1841                         goto cont;
1842
1843                 /* Finally check that all iftypes that we're currently
1844                  * using are actually part of this combination. If they
1845                  * aren't then we can't use this combination and have
1846                  * to continue to the next.
1847                  */
1848                 if ((all_iftypes & used_iftypes) != used_iftypes)
1849                         goto cont;
1850
1851                 if (beacon_int_gcd) {
1852                         if (c->beacon_int_min_gcd &&
1853                             beacon_int_gcd < c->beacon_int_min_gcd)
1854                                 goto cont;
1855                         if (!c->beacon_int_min_gcd && beacon_int_different)
1856                                 goto cont;
1857                 }
1858
1859                 /* This combination covered all interface types and
1860                  * supported the requested numbers, so we're good.
1861                  */
1862
1863                 (*iter)(c, data);
1864  cont:
1865                 kfree(limits);
1866         }
1867
1868         return 0;
1869 }
1870 EXPORT_SYMBOL(cfg80211_iter_combinations);
1871
1872 static void
1873 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1874                           void *data)
1875 {
1876         int *num = data;
1877         (*num)++;
1878 }
1879
1880 int cfg80211_check_combinations(struct wiphy *wiphy,
1881                                 struct iface_combination_params *params)
1882 {
1883         int err, num = 0;
1884
1885         err = cfg80211_iter_combinations(wiphy, params,
1886                                          cfg80211_iter_sum_ifcombs, &num);
1887         if (err)
1888                 return err;
1889         if (num == 0)
1890                 return -EBUSY;
1891
1892         return 0;
1893 }
1894 EXPORT_SYMBOL(cfg80211_check_combinations);
1895
1896 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1897                            const u8 *rates, unsigned int n_rates,
1898                            u32 *mask)
1899 {
1900         int i, j;
1901
1902         if (!sband)
1903                 return -EINVAL;
1904
1905         if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1906                 return -EINVAL;
1907
1908         *mask = 0;
1909
1910         for (i = 0; i < n_rates; i++) {
1911                 int rate = (rates[i] & 0x7f) * 5;
1912                 bool found = false;
1913
1914                 for (j = 0; j < sband->n_bitrates; j++) {
1915                         if (sband->bitrates[j].bitrate == rate) {
1916                                 found = true;
1917                                 *mask |= BIT(j);
1918                                 break;
1919                         }
1920                 }
1921                 if (!found)
1922                         return -EINVAL;
1923         }
1924
1925         /*
1926          * mask must have at least one bit set here since we
1927          * didn't accept a 0-length rates array nor allowed
1928          * entries in the array that didn't exist
1929          */
1930
1931         return 0;
1932 }
1933
1934 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1935 {
1936         enum nl80211_band band;
1937         unsigned int n_channels = 0;
1938
1939         for (band = 0; band < NUM_NL80211_BANDS; band++)
1940                 if (wiphy->bands[band])
1941                         n_channels += wiphy->bands[band]->n_channels;
1942
1943         return n_channels;
1944 }
1945 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1946
1947 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1948                          struct station_info *sinfo)
1949 {
1950         struct cfg80211_registered_device *rdev;
1951         struct wireless_dev *wdev;
1952
1953         wdev = dev->ieee80211_ptr;
1954         if (!wdev)
1955                 return -EOPNOTSUPP;
1956
1957         rdev = wiphy_to_rdev(wdev->wiphy);
1958         if (!rdev->ops->get_station)
1959                 return -EOPNOTSUPP;
1960
1961         memset(sinfo, 0, sizeof(*sinfo));
1962
1963         return rdev_get_station(rdev, dev, mac_addr, sinfo);
1964 }
1965 EXPORT_SYMBOL(cfg80211_get_station);
1966
1967 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1968 {
1969         int i;
1970
1971         if (!f)
1972                 return;
1973
1974         kfree(f->serv_spec_info);
1975         kfree(f->srf_bf);
1976         kfree(f->srf_macs);
1977         for (i = 0; i < f->num_rx_filters; i++)
1978                 kfree(f->rx_filters[i].filter);
1979
1980         for (i = 0; i < f->num_tx_filters; i++)
1981                 kfree(f->tx_filters[i].filter);
1982
1983         kfree(f->rx_filters);
1984         kfree(f->tx_filters);
1985         kfree(f);
1986 }
1987 EXPORT_SYMBOL(cfg80211_free_nan_func);
1988
1989 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1990                                 u32 center_freq_khz, u32 bw_khz)
1991 {
1992         u32 start_freq_khz, end_freq_khz;
1993
1994         start_freq_khz = center_freq_khz - (bw_khz / 2);
1995         end_freq_khz = center_freq_khz + (bw_khz / 2);
1996
1997         if (start_freq_khz >= freq_range->start_freq_khz &&
1998             end_freq_khz <= freq_range->end_freq_khz)
1999                 return true;
2000
2001         return false;
2002 }
2003
2004 int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
2005 {
2006         sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
2007                                 sizeof(*(sinfo->pertid)),
2008                                 gfp);
2009         if (!sinfo->pertid)
2010                 return -ENOMEM;
2011
2012         return 0;
2013 }
2014 EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
2015
2016 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
2017 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
2018 const unsigned char rfc1042_header[] __aligned(2) =
2019         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
2020 EXPORT_SYMBOL(rfc1042_header);
2021
2022 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
2023 const unsigned char bridge_tunnel_header[] __aligned(2) =
2024         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
2025 EXPORT_SYMBOL(bridge_tunnel_header);
2026
2027 /* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
2028 struct iapp_layer2_update {
2029         u8 da[ETH_ALEN];        /* broadcast */
2030         u8 sa[ETH_ALEN];        /* STA addr */
2031         __be16 len;             /* 6 */
2032         u8 dsap;                /* 0 */
2033         u8 ssap;                /* 0 */
2034         u8 control;
2035         u8 xid_info[3];
2036 } __packed;
2037
2038 void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
2039 {
2040         struct iapp_layer2_update *msg;
2041         struct sk_buff *skb;
2042
2043         /* Send Level 2 Update Frame to update forwarding tables in layer 2
2044          * bridge devices */
2045
2046         skb = dev_alloc_skb(sizeof(*msg));
2047         if (!skb)
2048                 return;
2049         msg = skb_put(skb, sizeof(*msg));
2050
2051         /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
2052          * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
2053
2054         eth_broadcast_addr(msg->da);
2055         ether_addr_copy(msg->sa, addr);
2056         msg->len = htons(6);
2057         msg->dsap = 0;
2058         msg->ssap = 0x01;       /* NULL LSAP, CR Bit: Response */
2059         msg->control = 0xaf;    /* XID response lsb.1111F101.
2060                                  * F=0 (no poll command; unsolicited frame) */
2061         msg->xid_info[0] = 0x81;        /* XID format identifier */
2062         msg->xid_info[1] = 1;   /* LLC types/classes: Type 1 LLC */
2063         msg->xid_info[2] = 0;   /* XID sender's receive window size (RW) */
2064
2065         skb->dev = dev;
2066         skb->protocol = eth_type_trans(skb, dev);
2067         memset(skb->cb, 0, sizeof(skb->cb));
2068         netif_rx_ni(skb);
2069 }
2070 EXPORT_SYMBOL(cfg80211_send_layer2_update);
2071
2072 int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
2073                               enum ieee80211_vht_chanwidth bw,
2074                               int mcs, bool ext_nss_bw_capable)
2075 {
2076         u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
2077         int max_vht_nss = 0;
2078         int ext_nss_bw;
2079         int supp_width;
2080         int i, mcs_encoding;
2081
2082         if (map == 0xffff)
2083                 return 0;
2084
2085         if (WARN_ON(mcs > 9))
2086                 return 0;
2087         if (mcs <= 7)
2088                 mcs_encoding = 0;
2089         else if (mcs == 8)
2090                 mcs_encoding = 1;
2091         else
2092                 mcs_encoding = 2;
2093
2094         /* find max_vht_nss for the given MCS */
2095         for (i = 7; i >= 0; i--) {
2096                 int supp = (map >> (2 * i)) & 3;
2097
2098                 if (supp == 3)
2099                         continue;
2100
2101                 if (supp >= mcs_encoding) {
2102                         max_vht_nss = i + 1;
2103                         break;
2104                 }
2105         }
2106
2107         if (!(cap->supp_mcs.tx_mcs_map &
2108                         cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
2109                 return max_vht_nss;
2110
2111         ext_nss_bw = le32_get_bits(cap->vht_cap_info,
2112                                    IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
2113         supp_width = le32_get_bits(cap->vht_cap_info,
2114                                    IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
2115
2116         /* if not capable, treat ext_nss_bw as 0 */
2117         if (!ext_nss_bw_capable)
2118                 ext_nss_bw = 0;
2119
2120         /* This is invalid */
2121         if (supp_width == 3)
2122                 return 0;
2123
2124         /* This is an invalid combination so pretend nothing is supported */
2125         if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
2126                 return 0;
2127
2128         /*
2129          * Cover all the special cases according to IEEE 802.11-2016
2130          * Table 9-250. All other cases are either factor of 1 or not
2131          * valid/supported.
2132          */
2133         switch (bw) {
2134         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2135         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2136                 if ((supp_width == 1 || supp_width == 2) &&
2137                     ext_nss_bw == 3)
2138                         return 2 * max_vht_nss;
2139                 break;
2140         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2141                 if (supp_width == 0 &&
2142                     (ext_nss_bw == 1 || ext_nss_bw == 2))
2143                         return max_vht_nss / 2;
2144                 if (supp_width == 0 &&
2145                     ext_nss_bw == 3)
2146                         return (3 * max_vht_nss) / 4;
2147                 if (supp_width == 1 &&
2148                     ext_nss_bw == 3)
2149                         return 2 * max_vht_nss;
2150                 break;
2151         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2152                 if (supp_width == 0 && ext_nss_bw == 1)
2153                         return 0; /* not possible */
2154                 if (supp_width == 0 &&
2155                     ext_nss_bw == 2)
2156                         return max_vht_nss / 2;
2157                 if (supp_width == 0 &&
2158                     ext_nss_bw == 3)
2159                         return (3 * max_vht_nss) / 4;
2160                 if (supp_width == 1 &&
2161                     ext_nss_bw == 0)
2162                         return 0; /* not possible */
2163                 if (supp_width == 1 &&
2164                     ext_nss_bw == 1)
2165                         return max_vht_nss / 2;
2166                 if (supp_width == 1 &&
2167                     ext_nss_bw == 2)
2168                         return (3 * max_vht_nss) / 4;
2169                 break;
2170         }
2171
2172         /* not covered or invalid combination received */
2173         return max_vht_nss;
2174 }
2175 EXPORT_SYMBOL(ieee80211_get_vht_max_nss);
2176
2177 bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype,
2178                              bool is_4addr, u8 check_swif)
2179
2180 {
2181         bool is_vlan = iftype == NL80211_IFTYPE_AP_VLAN;
2182
2183         switch (check_swif) {
2184         case 0:
2185                 if (is_vlan && is_4addr)
2186                         return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2187                 return wiphy->interface_modes & BIT(iftype);
2188         case 1:
2189                 if (!(wiphy->software_iftypes & BIT(iftype)) && is_vlan)
2190                         return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
2191                 return wiphy->software_iftypes & BIT(iftype);
2192         default:
2193                 break;
2194         }
2195
2196         return false;
2197 }
2198 EXPORT_SYMBOL(cfg80211_iftype_allowed);